Effects of Different Diets on Uptake and Utilization of Milk Fat Precursor of Lactating Dairy Cows

SONG Liwen, AO Changjin, Haaserdene, ZHANG Hang, LIU Shuaiwang

doi:10.3969/j.issn.1006-267x.2017.08.038

Chinese Journal of Animal Nutrition >

2017 , Vol. 29 >Issue 8: 2931 - 2942

DOI: https://doi.org/10.3969/j.issn.1006-267x.2017.08.038

Molecular Nutrition

Effects of Different Diets on Uptake and Utilization of Milk Fat Precursor of Lactating Dairy Cows

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College of Animal Science and Technology, Inner Mongolia Agricultural University, Hohhot 010018, China

Received date: 2017-01-22

Online published: 2017-08-02

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Abstract

The objective of this study was to determine uptake and utilization of milk fat precursor of lactating dairy cows under different diets conditions. Nine healthy Holstein cows with body weight of (617±21) kg, lactation days of (120±20) d were selected as experimental animals. Cows were divided into 3 groups with 3 cows per group using a 3 repeated 3×3 Latin square design. Two groups was designed with different concentrates, but the same roughage of corn straw, and the concentrate to roughage ratio was 6: 4 (named CSA and CSB groups, respectively); the rest group used Chinese wildrye, alfalfa hay and corn silage as mixing roughage (MF group), and the concentrate to roughage ratio was 4: 6. The experiment lasted for 84 d consisting of 3 periods with 28 d per period, and each period consisted of 21 d for pretest and 7 d for test. The results showed as follows: 1) no significant differences in milk yield and milk composition were observed among groups (P>0.05), MF group had significantly higher dairy efficiency compared with CSA and CSB groups (P<0.05). 2) Dietary C16: 0 and C18: 0 intakes were not significantly different among groups (P>0.05); dietary C18: 1 c9 intake in MF group was significantly lower than that in CSA and CSB groups (P<0.05). 3) The intake of long chain fatty acids and total fatty acids contents in arterial and venous plasma in MF group were higher than those in CSA and CSB groups, especially C18: 3 n3 content was significantly higher than that in CSA and CSB group (P<0.05). 4) C18: 3 n3 intake of mammary gland (daily mean) in MF and CSB groups were significantly higher than that in CSA group; intakes of the other long chain fatty acids of mammary gland were not significantly different among groups (P>0.05). 5) Ultimately reflected in milk, C18: 3 n3 yield in MF group tended to be higher than that in CSA and CSB groups (0.05≤P<0.10), and C18: 2 n6 yield in MF group was significantly lower than that in CSA and CSB group (P<0.05), mammary gland intake of which was formerly had no significant difference (P>0.05). In conclusion, diet with different roughages and the same concentrate has no significant effects on performance of lactating dairy cows, while even under the condition of decreased concentrate proportion, high quality roughages can affect milk fatty acid composition and yield, and adjusts it to be better for human health.

Key words： lactating dairy cow; roughage; milk fat; fatty acid; mammary gland uptake

Cite this article

SONG Liwen, AO Changjin, Haaserdene, ZHANG Hang, LIU Shuaiwang . Effects of Different Diets on Uptake and Utilization of Milk Fat Precursor of Lactating Dairy Cows[J]. Chinese Journal of Animal Nutrition, 2017 , 29(8) : 2931 -2942 . DOI: 10.3969/j.issn.1006-267x.2017.08.038

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